1212400101 has 16 divisors (see below), whose sum is σ = 1867226688. Its totient is φ = 691564800.

The previous prime is 1212400099. The next prime is 1212400139. The reversal of 1212400101 is 1010042121.

It is a happy number.

It is not a de Polignac number, because 1212400101 - 2¹ = 1212400099 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1212400141) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1080010 + ... + 1081131.

It is an arithmetic number, because the mean of its divisors is an integer number (116701668).

Almost surely, 2^1212400101 is an apocalyptic number.

1212400101 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1212400101 is a deficient number, since it is larger than the sum of its proper divisors (654826587).

1212400101 is a wasteful number, since it uses less digits than its factorization.

1212400101 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2161172.

The product of its (nonzero) digits is 16, while the sum is 12.

The square root of 1212400101 is about 34819.5361973706. The cubic root of 1212400101 is about 1066.3063314883.

Adding to 1212400101 its reverse (1010042121), we get a palindrome (2222442222).

The spelling of 1212400101 in words is "one billion, two hundred twelve million, four hundred thousand, one hundred one".